Start creating a very simple CesiumWidget to replace the Dojo-based one.
Switch Sandcastle examples to new standalone CesiumWidget.
Merge branch 'master' into cesium-widget
Merge remote-tracking branch 'origin/master' into cesium-widget

Conflicts:
	build.xml
Merge branch 'master' into cesium-widget
Move CesiumWidget into its own subdirectory to be consistent with other widgets.
Some minor widget tweaks.  Major changes to come.
Merge branch 'master' into cesium-widget
Merge branch 'master' into cesium-widget
Ongoing CesiumWidget work.

1. Simplify the widget so it only contains the most common options.
2. Update SandCastle examples so that they all work
3. Delete Dojo's CesiumWidget, since it's not needed.
Update CHANGES.
Minor doc tweaks.
Changes after review

1. Rename options.baseMap to options.imageryProvider
2. Modify `destroyObject` to no longer delete properties.
3. Add destroy and isDestroyed functions to CesiumWidget, to ensure proper cleanup.
4. Add a sanity check spec fo CesiumWidget.
Update jQuery demo to use new widget, and add a one-line demo.
Replace Hello World with one-line sample.
Merge pull request #577 from AnalyticalGraphicsInc/cw-more-demos

Update jQuery demo to use new widget, and add a one-line demo.
Merge pull request #575 from AnalyticalGraphicsInc/cesium-widget

Cesium widget
Merge remote-tracking branch 'agi/master' into optimizeImageryAlpha
allow tiles to be rendered before zero alpha layers are loaded, replace epsilon check with compare to 0.0